Hi Counter
Hi Counter

Sleep Counter

Calculate the best bedtime or wake-up time based on 90-minute sleep cycles. Optimise your sleep schedule for better rest and more energy.

Select a Time

Choose your target wake-up or bedtime above, and we'll calculate the best times based on natural 90-minute sleep cycles.

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How to Use

1

Choose Mode

Select whether you want to find the best bedtime or wake-up time based on your schedule.

2

Set Your Time

Enter your desired wake-up time or bedtime. We factor in 14 minutes to fall asleep.

3

Pick the Best Option

Choose from 6 suggestions. The "Best" badge marks the option with the most sleep cycles.

About This Tool

Calculate the best bedtime or wake-up time based on 90-minute sleep cycles. Optimise your sleep schedule for better rest and more energy.

Wake up feeling refreshed by aligning your sleep schedule with natural 90-minute sleep cycles. Our calculator finds the optimal bedtime or wake-up time so you never wake up mid-cycle again.

All data is stored locally in your browser and never uploaded to any server. No registration required.

90-Minute Cycle Science

Calculations are based on the natural 90-minute sleep cycle so you wake up between cycles, not mid-cycle.

Dual Mode — Wake Up or Fall Asleep

Choose whether you want to find the ideal bedtime or the best wake-up time based on your schedule.

Fall-Asleep Adjustment

A built-in 14-minute buffer accounts for the average time it takes to fall asleep, keeping your cycles accurate.

Learn More

1

Better Wake-Up Timing — Set your alarm for the end of a sleep cycle so you wake up feeling refreshed instead of groggy.

2

Shift Work Scheduling — Quickly find the best sleep window when your work hours change from day to night.

3

Jet Lag Recovery — Adjust your bedtime gradually across time zones by calculating optimal sleep and wake times.

Frequently Asked Questions